A banker's bill, also commonly known as a banknote or a currency note, is a type of legal tender that is issued by a central bank for general circulation in a country. There are many synonyms used to refer to a banker's bill, including banknote, bill, currency, note, paper currency, paper money, and cash. These terms are often used interchangeably, but they all refer to the same concept - a physical representation of a specific value of currency. Banker's bills have been in use for centuries, and they remain an essential component of modern financial systems around the world today.